Dust-collector.



in. 854,516. PATENTED MAY 21, 1907.

P. m m. DUST COLLECTOR. APPLICATION FILED AUG. 17, 1904.

2 SHEETS-$311111! 1.

2 SHEETE-SHEBT 2.

WITNESSES: v c\ INVE y F ATjbRNEX STATES PATENT err-Ion.

PHILIP .o. MILLER, or CHICAGO, ILLINoIs.

DUST-COLLECTOR.

To (1.7] 10710111 it nan/y concern:

Be it known that I, PHILIP C. MILLER, residing at Chicago, in the countyof Cook and State of Illinois, have invented a certain new and usefulImprovement in Dust-Collectors;

V centrifugal motion will be produced whichwill tend to cause theparticles of dust to be projected to the periphery of said current ofair and against the wall of the chamber, whence they will traveldownward toward an orifice in the bottom; while the air which has beenfreedfrom the dust particles escapes from the top of the said chamber.It is cus-' tomary in devices of this character to insert a downwardlydepending tubular guard through whichthe purified air escapes. The airescaping through this tubular guard still having its 'gyrating movement,escapes only at the edge of the outlet, and the aXis of said current isnot only of no value as an outlet but really draws in a current of air.For thisreason, since only the outer edge of the orifice is available todischarge the air current, it has been found necessary in the practicalconstruction of dust collectors to construct the opening at the top ofthe chamber, which is-provided for the escape of the purified air, of amuch greater area than the feed, and since these dust collectors,although light, are necessarily very bulky, a very considerable space isexposed to the atmosphere, which is obj ectionable because of theliability of rain entering through said opening and being led to theinterior of the building and feeders which it clogs up bywetting thedust and causing it to collect in them,-but it is also very liable toreceive sparks from the smokestack of the factory whereit is used, andin this way-cause a fire, as it 1s generally set on the boiler room roofover the shavings vault.

- These objections can, of course, be overcome by hooding the opening,but this is a decidedly 'expensive method, owing to the large size ofthe opening.

The object of my invention is to provide a tubular guard constructedinsuch a manner that it will permit the reduction of the opening to theminimum without creating-too 'much back pressure.-

The method of accomplishing the foregoing may be more readily understoodby hav- Specification of Letters Patent. Ap li ation m August 17,1904.sum No. 220,998.

this specification, and in which Patented May-QI, 1907.

ing reference to the accompanying drawings, which are hereunto annexedand are a part of Figurel is an elevation partly in section, of a dustcollector, showing my improved tubular guard. Fig. 2 is aplan view ofthe same. Figs. 3, '4, 5, 6, and 7 are views showing my improved guardap lied to various types of dust collectors to which my invention isapplicable- Similar letters refer to similar parts throughout the entiredescription.

' In the drawings, a represents the frame of the dust collector. a theconical or tapering separating chamber.

0, represents the spout through which the dustladenair enters thelargeend of the separating chamber ain a tangential direction, (t representsthe discharge 0 ening for the dust' formed at the apex of t e separatingchamber. v w

a represents the cover which closes'the upper end of the inverted cone 0and which is provided with a central opening a throu h which thepurified air escapes. g

a is my improved tapering tubular ard secured in the opening aprojecting o This wardlyinto the se arating chamber. tube is constructewith tapering walls so that the lower end a, is of a greater diameterthan the top a. The dust-laden air being led into the cone through thespout a assumes a rotary motion due to the direction given to it by thespout, forming a vortex in which the dust particles are projected aainst the inner surface of the cone a, freeing t e inner portion of thewhirling current of air from dust. This air being freed from dustescapes through the interior of the tapering tubular guard a, the resultof the taper being that instead of a very thin layer of air esca ing atthe outer edges of the opening 0?, win e not producing any back pressurecauses the strata to thicken, and in thismanner utilize nearly, if notall, of the area of said openin The advantage of this is obvious in thatit permits the reduction of the opening atto the minimum, and to such anextent that the expense ofhooding it ceases to be of materialimportance, and in some cases it may not be necessary to hood since theentire area of the can enter when the system is operate and at nightthere are no sparks and the rain would do no.damage.-.

Having described my invention, what I reopening is used as an outlet, norain or s arks ggeircl a's 'iflewfandfdesire to secure by Letters ltem il ;The combination. with a downwardly a,pegiqg separating chamber havinga tan- "gent1al-d1 1 t-la,den air inlet, a dust escape at- -1ts'lowerend, and a depending tubularyguard tapering gpwardly to a res trictedair exit; t0 =p10 i d'e. a clear centml space for the escape ofpurified-air and eliminate the axial Jack 0w. 2 .The combination with avertical. cylin- Ever havine' a tangential dust-laden air inlet, of adownwardly tapering separating chamber having a dust escape at its lowerend, and & degending tubula'r guard tapering upwardly to a; restricieclair exit; to provide a clear central space fol; the esca e of purifiedair and. eliminate the axial bacl: flow.

PHILIP G. MILLER.

W1 messes F. H. PRODOEHL. G. KLUGE.

